A Composite Number can be divided evenly by numbers other than 1 or itself.
The Composite Numbers Between 1 and 10 are as follow.
4, 6, 8, 9, 10.
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The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.
The composite numbers between 1 and 10 are 4, 6, 8, 9, 10. And their sum is 37.
11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.
The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
All numbers other than 11, 13 ,17, 19 ,23,29, 31 are composite numbers. eg 10,12,14,15, are composite numbers.